JP2002526019A - Electric motor - Google Patents

Abstract

(57) [Summary] At least one magnetic pole piece comprising at least one stator laminated iron core, mechanically separate magnetic poles, and magnetic poles connected in the circumferential direction of the stator, facing at least one magnetic pole axis and the rotor side Comprising a concave portion provided on one surface of the laminated plate and a convex portion provided on a surface on the opposite side thereof, and fitting each concave portion and convex portion of the adjacent laminated plate to each other. In a motor provided with a web that couples the concave and convex portions of the laminated plate forming the stator laminated core, the windings wound around the mechanical magnetic poles of the stator laminated core, and the mechanical poles connected in the circumferential direction, The laminate of the daughter laminated core consists of magnetic poles with and without connecting webs, which alternate in a predetermined order in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

 The present invention relates to an electric motor, and more particularly to a stator laminated iron core and a method for manufacturing the same.

[0002] Laminated or laminated cores help guide the magnetic field.

[0003]

[Prior art]

According to German Utility Model No. 1882073, a preferably circular recess is provided on one side of the laminate, and a convex is formed on the opposite side, and a plurality of such laminates are formed with the concave and convex. 2. Description of the Related Art A laminated open / close electromagnet in which parts are fitted to each other to form one laminated iron core of the open / close electromagnet is known.

In this configuration, it is difficult to optimally arrange the laminates so that the magnetic properties of the electric motor and thus the allowable mutual angular positions without impairing the driving operation can be set. In addition, this leads to problems when mounting the windings.

[0005]

[Problems to be solved by the invention]

Under such a premise, an object of the present invention is to provide a structure of a stator laminated iron core of an electric motor that can be manufactured easily and inexpensively and that achieves comparable magnetic characteristics of the electric motor. is there.

[0006]

[Means for Solving the Problems]

 The problem is that: a) at least one stator laminated iron core formed by laminated plates stacked on top of each other; b) mechanically separate magnetic poles and magnetic poles connected in the circumferential direction of the stator, at least A laminate comprising one pole axis and at least one pole piece facing the rotor; c) a recess provided on one surface of the laminate and a protrusion provided on the opposite surface. And d) stator lamination cores arranged to form a stator lamination core by fitting respective recesses and projections of adjacent laminations to each other. E) webs between the magnetic poles that connect the circumferentially connected mechanical magnetic poles; and g) the axial configuration of the laminated plate of the stator laminated core is predetermined. The connection webs are changed in the order of And magnetic pole is solved by an electric motor having the features consisting of a pole which does not include.

[0007] Such an electric motor is produced by the following methods: a) mechanically individual magnetic poles and / or magnetic poles connected in the circumferential direction are punched out in a multi-stage die, and b) formed by this punching. The laminates are laminated in a predetermined order; c) A coil pre-wound is mounted on a magnetic pole shaft projecting radially outward and / or inward; d) The entire stator laminated iron core is molded and And / or by impregnation.

The stator laminated iron core of the electric motor according to the present invention can be manufactured by a small number of simple steps. Therefore, this method can be easily automated. Because the stator's laminated core has electromagnetic properties comparable to conventional motors due to its optimized construction, no power loss of the motor is recorded. The stator laminated iron core is obtained by laminating the laminated plates in a predetermined order, using a mandrel for assembling as necessary.
It has a pole axis that protrudes inward (towards the gap) or outwardly, depending on whether the connected laminates of poles are joined together at their outer periphery or at their pole pieces.

[0009] These pole axes are therefore provided with windings from the inside or the outside. In that case, all winding shapes, winding connections and winding methods, for example, two-layer fraction groove windings can be applied. With this structure of the stator laminated core, it is possible to fit a magnetic pole coil, which is particularly a slotted coil, to the magnetic pole axis of the laminated core. In that case, the spirally wound coil is almost arbitrarily arranged on the magnetic pole axis in the circumferential direction, and the required motor characteristics, for example, reduction of torque ripple can be obtained.

The fixing of the winding is performed by molding or impregnating the laminated core.
As a result, in addition to the mechanical fixing and compactness of the laminated core, electrical insulation between the windings can be achieved. Similarly, alternatively or additionally, the mechanical fastening of the windings can be applied to the pole shaft on which the windings are mounted, for example in the form of wedges and / or pole pieces.

For magnetic reasons, and in particular to minimize leakage flux, only some of the laminates form a magnetically conductive connection with the pole pieces. On the other hand, some laminates whose pole pieces are not magnetically connected have an optimized groove opening width between the pole pieces, which substantially avoids pole saturation. By inclining the grooves in the axial direction of the stator laminated core, the groove locking moment (Nutrastmomente) is further reduced. In addition, the connecting web between the poles of such a laminate allows the additional mechanical and magnetic loads during the motor operation of the individual poles to be permanently fixed in their position.

The optimal arrangement of the entire laminated core at the corners between the individual laminated plates can be achieved by the number of recesses per laminated plate. In that case, it is particularly preferable to provide two concave portions. This is because the recesses beyond that become rather redundant and hinder the optimal arrangement of the laminated boards and the mutual corner positions.

[0013] The laminated core has a modular structure, and the finishing of the stator bore can be eliminated. This makes it possible to omit a processing step involving a risk of generating metal chips in the laminated iron core in the form of cutting. This metal waste is extremely cumbersome and time-consuming to remove from the laminated core, and there is a danger that the operation of the motor will always be impaired.

In another embodiment, the laminate of the first layer of the stator lamination core has no recesses, and the lamination of the last layer of the stator lamination core also has no projections, for example, When installing a blower or a brake in the range, there is no structural restriction, and the optimal characteristics of the electric motor can be realized in a compact structure.

In yet another preferred embodiment, the laminated core is mounted on a magnetic return yoke. In that case, all geometrical, frictional or material coupling methods or combinations thereof are possible. When the laminated plates of magnetic poles connected in the circumferential direction are connected on the outer periphery of these magnetic poles, this makes it possible to realize a motor without a casing. In both the magnetic return yoke and in the laminate itself, a cooling device for operating the motor is provided. This cooling means is, in particular, a means for increasing the surface area of the cooling passage and / or the laminated core.

In a further variant, the laminated core is divided axially and / or into circular segment-like cores. This facilitates the manufacture of particularly large motors.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

BRIEF DESCRIPTION OF THE DRAWINGS The invention and other advantageous embodiments of the invention are described below with reference to the exemplary embodiments shown schematically in the drawings.

FIG. 1 shows a cross section of a symmetric star-shaped stator laminated core 1. The magnetic poles 2 arranged in a star shape of the laminated plate 6 are connected to each other by webs 4 in the circumferential direction of the magnetic pole pieces 3, and the magnetic pole pieces 3 close the rotor-side surface to the same plane. The arrangement of the webs 4 is also conceivable radially outward, so that the slot foot is facing the rotor. Similarly, the material of the web should match that of the pole piece 3.

The individual magnetic poles 7 can also be connected by magnetic or non-magnetic clamps.

The pole axis 5 is formed outwardly like a roof 10 and enables and facilitates a heat-shrinkable connection to a magnetic return yoke (not shown), thereby forming a star-shaped stator lamination core 1.
To prevent twisting. The magnetic pole shaft 5 is formed in a shape capable of being coupled to the magnetic return yoke radially outward as a contraction or compression seat. In order to fix the star-shaped stator laminated core 1, the star-shaped laminated core 1 can also be a rotary snap connection. In particular, in this case, the outside of the magnetic pole shaft 5 may be additionally formed in a convex surface, preferably in an arc shape, and the return yoke may be deformed in the elastic range by this connection.

By means of the laminated plates 6 which are circumferentially connected to the pole pieces 3, a preliminary arrangement of the individual poles 7, which are respectively between them in the axial direction, can be carried out by means of an assembly mandrel. By sandwiching the laminated plate 6 having the magnetic pole pieces 3 connected in the circumferential direction, an intermediate arrangement is obtained at a predetermined interval in the stator laminated core 1, and the overall arrangement of the laminated core 1 is optimized. The fixing of the laminated plate 6 of the laminated core 1 is performed by molding and / or impregnation.

FIG. 1 further shows a preferably circular recess 8 and a projection 9 provided on a laminate 6 provided with connecting pole pieces 3.

FIG. 2 shows a star-shaped laminated state of the laminated plate 6 by an external view of the stator laminated iron core 1.
In this figure, this laminated state is visible in partial cross sections of the laminated plates 6 arranged in several star shapes. Since the concave portions 8 and the convex portions 9 of the individual laminated plates 6 are fitted to each other, a densely laminated, radially immovable stator laminated core is generated. Further fixing of the laminated core 1 is effected by fitting the individual laminated plates 6 with the connected pole pieces 3. Additional fixing can be achieved by molding and / or impregnating the laminated core 1.

The basic laminated structure is configured as follows. That is, a laminated plate 6 composed of magnetic poles 2 provided on the end face side of the stator laminated core 1 with magnetic pole pieces 3 connected in the circumferential direction of the stator.
Is arranged. Arranged between them are laminated plates 6 of individual magnetic poles 7, which are reinforced at predetermined axial intervals, preferably at intervals of 5 laminated plates, by laminated plates 6 with radially connected pole pieces 3. ing. The magnetic poles 2 and 7 may have a plurality of concave portions 8 or concave portions 8 and convex portions 9 alternately arranged on each surface, and the stator laminated core 1 may be fixed in the radial direction. The arrangement of the depressions 8 or the projections 9 in this case has only a technical minor role and depends in particular on the economic and technical point of view of the production method. Laminated board 6
Other connections, such as hook-like connections, are likewise possible.

FIG. 3 is a partial external view of the laminated core 1 of the stator, and shows the laminated state of the laminated core 1 in more detail. In this figure, the different combinations of laminates 6, namely the poles 2 with webs 4, as well as the individual poles 7 are clearly visible.

FIG. 4 shows the configuration of the web 4 by a partial external view of the laminated core 1 of the stator viewed from the stator bore. In this way, it is possible to connect the pole piece 3 in which the web 4 is retracted radially outward with respect to the stator bore, and to connect the pole piece 3 which is closed flush with the stator bore. is there. The possibility of connecting one or the other of the pole pieces 3 depends on the method of assembly.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional view of a star-shaped laminated core of a stator.

FIG. 2 shows an external view of a star-shaped laminated core of a stator.

FIG. 3 shows a partial external view of one of the laminated cores.

FIG. 4 shows another partial external view of the laminated core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated iron core 2 Magnetic pole connected in the circumferential direction 3 Magnetic pole piece 4 Web 5 Magnetic pole axis 6 Laminated plate 7 Individual magnetic pole 8 Concave part 9 Convex part 10 Roof of magnetic pole axis

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Former, Rolf Germany-36129 Gersfeld Espenlaubstrasse 13 F-term (reference) 5H002 AA07 AA08 AB04 AB06 AC07 AE06 AE07 5H615 AA01 BB01 BB05 BB14 PP01 PP06 SS05 SS41 SS44

Claims (6)

[Claims] 1. a) at least one stator lamination core (1) formed by laminations (6) stacked on top of each other; b) mechanically separate magnetic poles (7) and the periphery of the stator. A laminated plate (6), comprising at least one pole axis (5) and at least one pole piece (3) facing the rotor, c) a laminated plate comprising: Each of the concave portions (8) of the laminated plate (6) having a concave portion (8) provided on one surface of (6) and a convex portion (9) provided on the surface on the opposite side thereof. The concave portion (8) and the convex portion (9) of the laminated plate (6) arranged so as to form the stator laminated core (1) by fitting the stator and the convex portion (9) to each other, d) the stator laminated core (1) windings wound around the mechanical poles (2, 7), and e) mechanical poles connected in the circumferential direction ( 2) a web (4) between the magnetic poles (2) for connecting the two, and g) a connecting web in which the axial configuration of the laminated plate (6) of the stator laminated core (1) alternates in a predetermined order. A magnetic pole (2) and a magnetic pole (7) without a connecting web. 2. A laminated plate of the first and last layers in the axial direction of the stator laminated core (1).
6. The electric motor according to claim 1, wherein 6) comprises a connecting web. 3. The electric motor according to claim 1, wherein the laminated core is mountable on an external magnetic return yoke. 4. The magnetic return yoke according to claim 1, wherein the pole axis pointing outward in the radial direction is fixed to the magnetic return yoke by geometrical, mechanical or physical coupling or a combination of these couplings. 3. The electric motor according to 3. 5. A) mechanically individual magnetic poles (7) and / or circumferentially connected magnetic poles (2) are made by punching in a multi-stage die; b) a laminated plate (6) formed by punching C) A pre-wound coil is mounted on a pole shaft projecting radially outward and / or inward, and d) The entire stator laminated core (1) is molded and / or Or a method for producing a stator laminated iron core, comprising a step of impregnating. 6. The method according to claim 5, wherein the stator lamination core is mounted on a magnetic return yoke.